US PATENT SUBCLASS 40 / 469
.~.~ Magnetoclutch take-up

Current as of: June, 1999
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40 /   HD   CARD, PICTURE, OR SIGN EXHIBITING

446  DF  CHANGING EXHIBITOR {25}
463  DF  .~ With electric circuit control {5}
469.~.~ Magnetoclutch take-up

DEFINITION

Classification: 40/469

Magnetoclutch take-up:

(under subclass 463) Device comprising an electromagnet and an armature, the latter provided or connected with a ratchet-pawl to engage with and operate a ratchet-wheel of the changing exhibitor when an electric current is passed through the electromagnet.